that is some kind of bizarre anecdotal event that happened to peter because he is some weird educated doctor. maybe the nutritional advice we are getting is all wrong. back in the '60s believe that carbohydrates, bread, past ta were fattening. >> john: the picture of a piece of bread of butter on in your book. >> that is the idea it used to be the butter was considered healthy and the bread was consider fattening then the government decided it was something else and that coincides with obesity. >> john: they said margarine was bad for you? >> no it was good for you. >> now eggs are okay. >> and the reason for this flipping and flopping back and forth is because the kind of research we do to try and establish isn't capable of sort of establishing a definitive result. >> john: why don't we do this. it's important. >> it's really hard. you put the rat in the cage and it does what it does. >> john: double blind test with people. >> exactly. with drugs, it's real easy, it's take this pill or take this other pill. with nutrition, john i want you to follow this diet and it's hard to do. so w